EasyManua.ls Logo

Seiko 8T67A - User Manual

Seiko 8T67A
20 pages
Print Icon
To Next Page IconTo Next Page
To Next Page IconTo Next Page
Loading...
PARTS CATALOGUE / TECHNICAL GUIDE
Cal.8T67A
8T67A
Driving system Step motor 2 pieces
Additional function
Crown
Normal position Free
operation
1st click position Date setting (clockwise)
2nd click position Time setting, Resetting the circuit
Loss/Gain (Monthly rate) Less than 15 seconds at normal temperature range
Frequency of crystal oscillator 32,768 Hz
Operational temperature range
-5 ~ +50
Regulation system Nil
Gate time for rate measurement Use 10-second gate
Current consumption
Coil resistance
4002054Coil block A): 1.45 - 1.65KΩ for chronograph
4002055Coil block B): 1.65 - 1.85KΩ for time display
Power
Battery No.
SR936SW (Silver oxide battery)
supply
Battery voltage
1.55V
Battery life Approximately 3 years
Jewels
0 jewel
1/20
                Cal. No.
Item
Stopwatch function up to 12 hours in 1/5 second
Date display with quick correction.
Energy depletion forwarding function
(The second hand moves at two-second intervals.)
Movement: Less than 2.7μA
Circuit block: Less than 0.7μA

Questions and Answers

  • S
    smithcameronAug 4, 2025
    Why does my Seiko Accessories watch stop operating?
    • R
      Robert BakerAug 4, 2025
      Your Seiko Accessories watch might stop operating due to several reasons. The battery could be depleted, so measure the battery voltage and replace it if needed. Also, the hour wheel and pinion of the minute wheel might not be properly engaged, or the teeth could be broken, requiring replacement of the damaged parts. Poor conductivity from the circuit block cover or a broken coil could also be the cause; ensure the hooks are securely attached and replace the coil if necessary. Dirt, dust, or excessive oil can contaminate the wheels, so clean them carefully. High current consumption for the movement or circuit block could also be the problem; clean the movement or replace the circuit block after shutting out the light.
  • B
    Bryan LynchAug 9, 2025
    What to do if my Seiko Accessories watch stops because of a depleted battery?
    • J
      Joshua HolmesAug 9, 2025
      If your Seiko Accessories watch stops due to a depleted battery, measure the battery voltage. If the voltage is low, replace the battery with a new one.
  • A
    Alexis ScottAug 13, 2025
    How to fix Seiko Accessories watch if hour wheel and minute wheel are not engaged?
    • M
      Michael ButlerAug 13, 2025
      If the hour wheel and the pinion of the minute wheel in your Seiko Accessories watch are not properly engaged, or if the teeth are broken, check the relevant parts. Replace any damaged parts with new ones.
  • K
    kirbyryanAug 18, 2025
    What to do if Seiko 8T67A Accessories watch stops due to circuit block cover issue?
    • F
      fmooreAug 18, 2025
      If your Seiko Accessories watch stops because the hooking portions of the circuit block cover are not properly engaged, resulting in poor conductivity, securely attach the hooks of the circuit block cover to the main plate. Also, measure the coil block resistance. If the coil is broken, replace it with a new one.
  • K
    Kimberly VazquezAug 25, 2025
    How to clean Seiko 8T67A Accessories watch wheels?
    • J
      josephphillipsAug 25, 2025
      If your Seiko Accessories watch stops because one or more wheels have been contaminated with dirt, dust, or other particles, or if excessive oil has caused adhesive forces among the parts, remove the dirt or dust and clean the contaminated wheels. Be careful not to damage the teeth of the plastic parts while cleaning.
  • A
    Amanda AndersonAug 29, 2025
    What to do if Seiko 8T67A watch has high current consumption?
    • M
      Morgan GutierrezAug 29, 2025
      If the current consumption for the whole movement of your Seiko Accessories watch exceeds the standard value, remove any dirt, dust, or foreign particles and clean the movement. If the current consumption for the circuit block alone is within the standard value range, overhaul and clean the movement parts, and then make the measurement again.

Summary

Tools and Consumables

Movement Holder Selection

Identifies the Universal Movement Holder (S-682) required for maintenance.

Watch Oil Types

Lists the specific SEIKO watch oils (AO-2, AO-3, S-6) needed for lubrication.

Disassembly and Reassembly Remarks

Part Identification Guidance

Table comparing parts for different caliber codes based on hand installation height.

Date Indicator Details

Details on date indicator parts code, positions, and colors.

Assembly Procedures

Chronograph Wheel Assembly

Guide to assembling the chronograph wheel using part marks and order.

Lubrication Guide

Component Lubrication Points

Detailed instructions on where to lubricate specific parts like the hammer and levers.

Spring Setting and Lever Adjustment

Component Spring Setting

Illustrates spring setting positions for various levers and components.

Switch Lever Setting

Details the correct setting positions for Switch Levers A and B.

Winding Stem and Battery Management

Winding Stem Removal Procedure

Step-by-step guide on how to safely remove the winding stem.

Battery Installation and Resetting

Instructions for removing and installing the battery, including circuit resetting.

Chronograph Hands Operations

Chronograph Hands Installation

Procedure for installing chronograph hands to specific dial positions after movement setup.

Hand Setting Verification

Method to check if the hands are set correctly and perpendicular to the axis.

Measurement and Inspection

Whole Movement Current Consumption

Procedure to measure current consumption of the entire movement using a digital multi-tester.

Circuit Block Current Consumption

Procedure to measure current consumption specifically for the circuit block.

Circuit Block and Coil Specifications

Circuit Block Component Layout

Diagram illustrating the structure and components of the circuit block.

Coil Resistance Measurement

Table and instructions for checking the resistance of coil blocks A and B.

Watch Operation and Settings

Time and Date Setting

Instructions for setting the time and date using the crown.

Reset Procedure After Battery Change

Two methods for resetting the movement after battery replacement.

Chronograph Functionality

Standard Chronograph Measurement

How to start, stop, and reset the chronograph for standard time measurement.

Accumulated Elapsed Time Measurement

Procedure for measuring accumulated elapsed time using the chronograph functions.

Water Resistance Testing

Water Resistance Standards and Methods

Table outlining water resistance markings, test methods, and corresponding pressure ratings.

Troubleshooting Movement Issues

Watch Stops Operating

Identifies causes like depleted battery, disengaged wheels, or coil issues and provides solutions.

Excessive Current Consumption

Lists causes for high current consumption and recommended corrective actions.

Troubleshooting Operational and External Issues

Stopwatch Malfunctions

Addresses issues like stopped hands, abnormal movement, or step motor problems, with solutions.

Exterior Parts and Water Resistance Issues

Covers problems like crown detachment, high current consumption, and water ingress.

Seiko 8T67A Specifications

General IconGeneral
BrandSeiko
Model8T67A
CategoryAccessories
LanguageEnglish

Related product manuals